Semimetallic SDW State in Quasi One-Dimensional Conductors

Imperfect nesting and scattering due to disorder in spin-density-waves

“…Extending earlier models by Horovitz et al [I] and Yamaji [2] we have shown recently [3] that the model with imperfect nesting can account for a number of features associated with SDW in Bechgaard salts like (TMTSF)2PF6 etc. and CDW's in NbSe3 within mean field theory.…”

Quantum oscillations in quasi-one-dimensional metals with spin-density-wave ground states

“…These include proton 8 and 77 Se NMR studies, 9 muon spin studies, 10 and theoretical treatments by Yamaji, 11 Montambaux,12 and Bjelis and Maki. 13 We take the view, based on the Korringa-like behavior of 77 Se NMR spin relaxation, the characteristic increase in T SDW with increasing field 14 and the existence of SdH-like oscillations, that the nesting is incomplete below T SDW .…”

“…5͑c͒, originate from Yamaji's treatment of the formation of the SDW state 1,11 in terms longitudinal and transverse hopping t a and t b , respectively. The influence of t b is characterized by the parameter 0 ϭt b 2 /t a ϫ1.4, which gauges the degree of imperfect nesting.…”

On a Field-Induced Spin-Density Wave in Bechgaard Salts

“…We note that a charge-density wave has been pointed out in a similar one-dimensional model [15], in connection with the magnetoresistance anomalies in graphite [16]. We shall restrict ourselves to looking for a SDW instability, as brought about by a purely electronic interaction of Hubbard type [17]. We shall also assume that there is only one partly filled top band, i.e.…”